carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

CarrierWave::Uploader::Versions::ClassMethods#version

Adds a new version to this uploader

=== Parameters

[name (#to_sym)] name of the version
[options (Hash)] optional options hash
[&block (Proc)] a block to eval on this version of the uploader

=== Examples

    class MyUploader < CarrierWave::Uploader::Base

      version :thumb do
        process :scale => [200, 200]
      end

      version :preview, :if => :image? do
        process :scale => [200, 200]
      end

    end

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git

cd carrierwave

open lib/carrierwave/uploader/versions.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-CarrierWave--Uploader--Versions--ClassMethods-version-for-pr

# Commit to git

git add lib/carrierwave/uploader/versions.rbgit commit -m "better docs for CarrierWave::Uploader::Versions::ClassMethods#version"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-CarrierWave--Uploader--Versions--ClassMethods-version-for-pr

hub pull-request

# Celebrate!